Among other things, Stefan Viljoen saw fit to write:

> No idea - freon should only be liquid at quite high pressure and thus most
> likely high temperature as well (sucking my thumb a bit here - not a
> scientist, me).

Usually, to liquefy a gas, you either raise the pressure or lower the
temperature (or both). So no, it can't be a liquid under higher
temperature, unless the effect of the pressure is more important. There are
some substances which melt (from solid to liquid) under pressure (water is
the paramount example), and recently some mixtures have been discovered to
solidify when heated, but I'm not aware of such "strange" behaviours
existing for the liquid/gas conversion.

According to google, some usual freons have boiling points around -30
degrees (Celsius or Fahrenheit, they're the same at -32) at 1 atm, that
means they can be liquid under normal pressure and not too low temperature.

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